Since it's a fanfic where Harry sets off his plan, it might involve him planning something related to his friends. For example, he could be devising a strategy to help Ron overcome his insecurities or to protect Hermione from a new threat in Hogwarts. It could also be a plan to change the way magic is taught or perceived in the wizarding community.
Obviously, Harry would be one of the main characters since it's his plan that is being set off. Hermione and Ron would most likely be involved too as they are his closest friends and often accompany him in his adventures. There might also be other characters like Dumbledore, if the plan has something to do with Hogwarts or the fight against dark magic, or perhaps some new characters created specifically for this fanfic.
Well, perhaps Harry uses his ice magic to create amazing sculptures in the Hogwarts courtyard. This would surely draw the attention of his friends and foes alike.
In the 'harry tells cho chang off fanfic', it could be that Cho Chang has been too clingy or possessive. Harry, who values his freedom and friendships, decides to tell her off. He might say that he needs space to focus on more important things like fighting against Voldemort and protecting Hogwarts. And he could also mention that her behavior is affecting his ability to do what he needs to do.
In the fanfic, Percy might show off his powers in a competition among demigods. He would display his combat skills along with his unique powers, like being able to communicate with sea creatures to gain an edge in the contest.
Well, without reading the specific fanfic, it's hard to say exactly. But generally in Harry Potter fanfics, Lily could have all sorts of plans. It might be related to protecting Harry, or perhaps something to do with the wizarding world's future. Maybe she has a plan to deal with Voldemort in a different way than in the original story.
Well, it could be that Harry meets his parents through some magical time - turner accident. Maybe he's on a mission in the past and stumbles upon them.
Maybe in the fanfic, Harry loses his temper when he discovers someone has betrayed his trust, like a false friend who leaked his secrets.
In the 'harry shows his power fanfic', perhaps it's a story where Harry has to show his power in a wizarding competition. He might use his unique abilities like Parseltongue to outwit his opponents and prove his worth. He could also draw on his connection with the Patronus charm to protect himself and others during the tasks.
Perhaps the fanfic focuses on Harry's emotional journey as he unleashes his power. He could start off being afraid of this newfound strength, but then learns to embrace it. He might face some internal struggles, like whether using his power is the right thing to do, especially if it has some unforeseen consequences.
Perhaps it's a story set in a fictional world. Harry and Lemon could have special powers. They use their powers to help their community or to solve a mystery that has been plaguing their town. They might start as normal siblings but through their experiences, they grow and become more confident in themselves and their abilities.